The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.Copyright (C) 2007 by HarperCollins Publishers.Cite This Source

plonk in Technology

networking, abuse (Possibly influenced by British slang "plonk" for cheap booze, or "plonker" for someone behaving stupidly; usually written "*plonk*") The sound a newbie makes as he falls to the bottom of a kill file. While this term originated in the Usenetnewsgroup news:talk.bizarre, by 1994 it was widespread on Usenet and mailing lists as a form of public ridicule. Another theory is that it is an acronym for "Person with Little Or No Knowledge". (2002-01-18)